Lysine-promoted colorimetric response of gold nanoparticles: a simple assay for ultrasensitive mercury(II) detection

Analytical Chemistry
Gulsu SenerAdil Denizli

Abstract

Although numerous methods have been reported for the analysis of toxic mercury (Hg(2+)) ions in drinking water, development of simple, rapid, inexpensive, and sensitive sensors still remains a great challenge. Here, we report a simple yet very sensitive colorimetric assay for rapid detection of Hg(2+) in water. The colorimetric assay is based on the aggregation of as-prepared citrate-capped gold nanoparticles (AuNPs) in the presence of Hg(2+) ions and the positively charged amino acid, lysine. The detection limit of this inexpensive colorimetric assay is 2.9 nM, which is below the limit value (10 nM) defined by the U.S. Environmental Protection Agency in drinkable water. Also, the colorimetric response of citrate-capped AuNPs in the presence of lysine is very selective to the Hg(2+). In addition, the colorimetric assay is very fast, and all analyses can be completed within a few minutes.

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Citations

Jan 18, 2016·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Sumei KongHua He
Oct 23, 2014·Analytical Chemistry·Atanu GhoshThalappil Pradeep
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Feb 24, 2021·Chemical Communications : Chem Comm·Zihao DengYun Zhang
May 25, 2021·Analytical Methods : Advancing Methods and Applications·Fereshteh AmouriziBehzad Hosseinzadeh

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